2279739

Information

• Patent Grant
• 2279739

• References
• Source

• Patent Number

  2,279,739

• Date Filed

  Not available

• Date Issued

  Tuesday, April 14, 1942
  83 years ago

• CPC

  • H04H20/83 - not sharing the network with any other service

• US Classifications

  • 455 - Telecommunications
  • 340 - Communications: electrical
  • 379 - Telephonic communications
  • 381 - Electrical audio signal processing systems and devices